答复: Encrypted Media Extension bugs for discussion during 2012-06-12 teleconference

Hi David

Thanks for your information.
And I enable all the flags you mentioned except sandbox, I do not know how to switch it off.

And I test the url you provided by chrome 21.0.1197.0

And JS report error MediaError 4 when I press the start button


Yang
Huawei
________________________________
孙扬
华为技术有限公司 Huawei Technologies Co., Ltd.
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发件人: David Dorwin [mailto:ddorwin@google.com]
发送时间: 2012年6月12日 12:18
收件人: Vickers, Mark
抄送: Paul Cotton; Sunyang (Eric); public-html-media@w3.org
主题: Re: Encrypted Media Extension bugs for discussion during 2012-06-12 teleconference


On Mon, Jun 11, 2012 at 8:04 PM, Vickers, Mark <Mark_Vickers@cable.comcast.com<mailto:Mark_Vickers@cable.comcast.com>> wrote:
There is also related work defining content protection requirements in the Web & TV IG Media Pipeline TF:

http://www.w3.org/2011/webtv/wiki/MPTF#Content_Protection


Thanks,
mav


On Jun 11, 2012, at 8:53 PM, "Paul Cotton" <Paul.Cotton@microsoft.com<mailto:Paul.Cotton@microsoft.com>> wrote:
The original email that described this proposal is at:
http://lists.w3.org/Archives/Public/public-html/2012Feb/0273.html

There are several references in that email that will provide background for the requirements that the proposal tries to meet.

And of course the proposal itself is at:
http://dvcs.w3.org/hg/html-media/raw-file/tip/encrypted-media/encrypted-media.html


There was a presentation and demo of the software implementing the proposal at the May F2F.  I am not sure if that presentation was ever archived but perhaps it could be posted in response to your request.

With Chrome/Chromium version 20 (current version of beta channel) or later, you can try the demo by running the following command line:
  chrome --enable-media-source --enable-encrypted-media --enable-video-track --no-sandbox http://downloads.webmproject.org/adaptive-encrypted-demo/adaptive/dash-player.html


Make sure you don't have any other Chrome instances running or the switches won't work.

David
/paulc

Paul Cotton, Microsoft Canada
17 Eleanor Drive, Ottawa, Ontario K2E 6A3
Tel: (425) 705-9596<tel:%28425%29%20705-9596> Fax: (425) 936-7329<tel:%28425%29%20936-7329>

From: Sunyang (Eric) [mailto:eric.sun@huawei.com<mailto:eric.sun@huawei.com>]
Sent: Monday, June 11, 2012 10:37 PM
To: David Dorwin; public-html-media@w3.org<mailto:public-html-media@w3.org>
Subject: 答复: Encrypted Media Extension bugs for discussion during 2012-06-12 teleconference

Hi David and all

Can anyone give me an introduction/background material (email, txt, word or ppt) about this encrypted media extension?
I plan to attend today’s conference call, and I am reading the bugs listed below.
Thanks a lot if any.

Yang
Huawei
________________________________
孙扬
华为技术有限公司 Huawei Technologies Co., Ltd.
<image001.jpg>


Phone: +86 25 56622934<tel:%2B86%2025%2056622934>
Fax: +86 25 56624081<tel:%2B86%2025%2056624081>
Mobile: +86 13851889004<tel:%2B86%2013851889004>
Email: eric.sun@huawei.com<mailto:eric.sun@huawei.com>
地址：南京市雨花区软件大道101号 华为南京基地 邮编：210012
Huawei Technologies Co., Ltd.
No 101,Software Avenue, Yuhua District,Nanjing 518129, P.R.China
http://www.huawei.com

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本邮件及其附件含有华为公司的保密信息，仅限于发送给上面地址中列出的个人或群组。禁
止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制、或散发）本邮件中
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发件人: David Dorwin [mailto:ddorwin@google.com]<mailto:[mailto:ddorwin@google.com]>
发送时间: 2012年6月12日 9:07
收件人: public-html-media@w3.org<mailto:public-html-media@w3.org>
主题: Re: Encrypted Media Extension bugs for discussion during 2012-06-12 teleconference

I changed the table to plain text below so it is hopefully more readable in the archives.

On Mon, Jun 11, 2012 at 5:40 PM, David Dorwin <ddorwin@google.com<mailto:ddorwin@google.com>> wrote:
In the first HTML WG media teleconference, we will discuss as many of the following Encrypted Media Extension bugs as we can get through. (See http://tinyurl.com/7tfambo for a full list.) I've provided some brief notes for each bug below the list. I'll also start threads for some of them.

ID          Sev Pri  OS  Assignee                           Status    Resolution    Summary
16612^  nor  P1   All  adrianba@microsoft.com<mailto:adrianba@microsoft.com> NEW     ---    Consider wrapping all encrypted media methods inside a new interface
16613    nor  P1   All  adrianba@microsoft.com<mailto:adrianba@microsoft.com> NEW     ---    Consider a more object-oriented design in which sessions are represented as objects
16548    nor  P2   All  adrianba@microsoft.com<mailto:adrianba@microsoft.com> NEW     ---    Require generateKeyRequest() in all cases for all Key Systems
16549^  nor  P2   All  adrianba@microsoft.com<mailto:adrianba@microsoft.com> NEW     ---    Remove initData parameter from addKey()
16552    nor  P2   All  adrianba@microsoft.com<mailto:adrianba@microsoft.com> NEW     ---    Consider making needkey a simple event
16738    nor  P2   All  adrianba@microsoft.com<mailto:adrianba@microsoft.com> NEW     ---    Provide more guidance on heartbeat implementation
17199    nor  P2   All  adrianba@microsoft.com<mailto:adrianba@microsoft.com> NEW     ---    Provide examples for and get feedback on Key Release

^ We will defer discussion of these since they depend on other bugs in this list.


* 16612: Read for background, but we will defer discussion until we decide on 16613.
* 16613: This is the most important since so many other bugs depend on or are affected by it. I've added some pros and cons as well as references to many other bugs that may be at least partially addressed by objects. There is a link to a formatted version of the bug in Comment 3<https://www.w3.org/Bugs/Public/show_bug.cgi?id=16613#c3>.
* 16548: Summary: Making the uncommon simplest case slightly more complex simplifies implementation and increases consistency.
* 16549: Read for background, but we will defer discussion until we decide on 16613 and 16548.
* 16552: Are there strong preferences for simple vs. complex events? Note that we could consider making all events simple if we address 16613.
* 16738: How should heartbeats be implemented? keymessage followed by a reply using addKey() or as separate key requests/sessions?
* 17199: It would be good to get more feedback in the area of key release, especially regarding whether KeyReleaseManager should be a singleton and/or a member of window.